For your consideration, here is a 1969 Brother of the Brush 1869 – 1969, Tacoma, Washington Centennial Pinback Button, Pin.  It has some wear, light scratch marks and some tarnish on the back.  The button has a diameter of 2 1/8 inches.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (605.226u-.4px2)